Egyptian Academic Journal of Biological Sciences,
Год журнала:
2023,
Номер
16(1), С. 133 - 139
Опубликована: Март 5, 2023
Fall
armyworm,
Spodoptera
frugiperda
(J.E
Smith)
(Noctuidae:
Lepidoptera)
has
become
a
serious
pest
in
maize.In
our
study,
we
evaluate
the
efficacy
of
Teflubenzuron
(Nomolt
®
15%
EC),
Emamectin
benzoate
(Proclaim
5%
SG)
and
Alfa-cypermethrin
(Fastac
EC)
on
fourth
instar
larvae
fall
armyworm
(FAW),
(Lepidoptera:
Noctuidae)
both
laboratory
field
experiments.The
results
revealed
that
LC50
values
obtained
were
0.18
ppm,
0.019
mg/ml,
0.6046
mg/ml
for
S.
treated
with
different
concentrations
Teflubenzuron,
α-cypermethrin
respectively.The
investigates
prolongation
larval
duration,
decreasing
pupation
%
pupal
duration.Field
application
against
was
expressed
as
percentage
reduction
population
residual
toxicity.Conclusion
study
insecticide
efficient
can
be
recommended
to
control
frugiperda.
Entomologia Generalis,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 3, 2025
Emamectin
benzoate
is
a
highly
effective
neurotoxic
insecticide
widely
used
to
control
pests,
including
Spodoptera
frugiperda
(Lepidoptera:
Noctuidae)
which
an
invasive
insect
spreading
worldwide.However,
the
toxicological
mechanism
has
yet
be
fully
elucidated.Particularly,
contribution
of
host
gut
microbiota
in
emamectin
benzoate-killing
activity
had
less
explored.Here,
we
demonstrated
that
triggered
toxicity
S.
frugiperda.Emamectin
changed
diversity
and
abundance
microbiota.It
reduced
immune-related
microbes
genes,
disrupted
balance
antioxidant
enzymes
destroyed
morphology.Simultaneously,
microorganisms
decompose
polysaccharides
gene
active
carbohydrate
enzyme
affected
metabolic
function
growth
insects.Most
importantly,
stimulated
genes
involved
anabolism
γ-aminobutyric
acid
by
catalyzing
production
more
key
neurotransmitters
leading
insects
death.This
study
first
provides
evidence
for
role
promoting
EMB
suggests
as
potential
target
development.
Agronomy,
Год журнала:
2025,
Номер
15(2), С. 358 - 358
Опубликована: Янв. 30, 2025
The
South
American
tomato
pinworm,
Tuta
absoluta
(Meyrick),
is
one
of
the
major
invasive
pests
that
causes
severe
economic
damage
to
several
hosts,
especially
plants,
globally.
Spinosad,
a
biopesticide
widely
used
against
insect
pests,
also
shows
promising
results
T.
absoluta.
Here,
we
investigated
evolution
spinosad
resistance
and
its
effects
on
biological
traits
related
gene
fully
understand
relationship
between
degree
associated
fitness
costs.
spinosad-resistant
strain
(SpRS)
with
moderate
level
(14.40-fold)
was
developed
following
continuous
selection
susceptible
(SS)
for
eight
generations.
Fitness
analysis
showed
larval
pupal
developmental
durations
were
significantly
increased,
while
adult
emergence
substantially
reduced
in
SpRS
compared
SS.
Adult
longevity
(male
female),
fecundity,
hatching
rates
decreased
Additionally,
expression
analyses
indicated
down-regulation
development
reproduction-related
genes
(Vg,
VgR,
JHBP,
JHAMT,
JHE,
JHDK)
population.
Further,
mRNA
resistance-related
cytochrome
P450
CYP321C40,
followed
by
CYP4M116,
CYP6AW1,
CYP339A1,
CYP6AB327,
increased
Taken
together,
these
although
accompanied
costs,
indiscriminate
use
might
elevate
level.
Overall,
findings
provide
important
information
about
trade-off
cost
be
crucial
designing
management
strategies
this
key
herbivore.
Agriculture,
Год журнала:
2022,
Номер
12(7), С. 959 - 959
Опубликована: Июль 3, 2022
Fall
armyworm
(FAW),
Spodoptera
frugiperda
(Lepidoptera:
Noctuidae),
is
a
highly
invasive
polyphagous
pest
that
causes
great
economic
losses
to
agricultural
production.
Emamectin
benzoate
(EMB)
one
of
the
most
popular
biopesticides
with
high
antipest,
anti-parasitic
and
anti-nematode
activities
low
toxicity.
The
present
study
was
conducted
determine
lethality
EMB
FAW
for
24
h.
Sublethal
effects
on
parental
offspring
generations
were
also
assessed.
LC10,
LC20
LC50
h
third
instar
larvae
0.0127
mg/L,
0.0589
0.1062
respectively.
A
dose
sublethal
concentrations
could
significantly
influence
life
cycle
generations.
concentration
(LC20)
prolonged
pupal
period
male
increased
weight
but
not
female,
delayed
oviposition
longevity
adult
FAW.
In
generation,
mortality
pupae
pre-adults,
reduced
development
time
pre-adult
female.
(LC10
LC20)
decreased
period.
However,
only
LC10
F1
female
fecundity.
No
significant
difference
found
in
intrinsic
rates
natural
increase
(rm),
finite
rate
population
(λ),
net
reproductive
(R0)
exposed
concentrations.
This
first
table
parameters
two
These
findings
can
provide
important
implications
rational
utilization
insecticides.
Industrial Crops and Products,
Год журнала:
2023,
Номер
195, С. 116437 - 116437
Опубликована: Фев. 24, 2023
The
development
of
effective
control
strategies
targeting
non-native
ambrosia
beetles
(Coleoptera:
Curculionidae:
Scolytinae
and
Platypodinae)
represents
an
emerging
challenge.
This
is
due
both
to
their
rapid
spread
into
climatically
suitable
newly
invaded
regions
rich
in
susceptible
host
plants
the
limited
knowledge
concerning
sustainable
management
tools.
In
this
context,
use
botanical
insecticides,
such
as
plant
essential
oils
(EOs),
considered
a
promising
option
Integrated
Pest
Management
(IPM)
alternative
conventional
insecticides
for
crop
protection.
Here,
impact
five
EO
nanoemulsions
(Rosmarinus
officinalis
L.
cultivar
verbenone,
Carlina
acaulis
L.,
Laurus
nobilis
Cupressus
sempervirens
Betula
alba
L.)
on
choice
behavior,
colonization
progeny
production
by
invasive
beetle
Xylosandrus
compactus
(Eichhoff)
was
evaluated
under
laboratory
semi-field
conditions.
chemical
composition
tested
EOs
firstly
means
gas
chromatography-mass
spectrometry
(GC-MS)
analyses.
Then,
were
prepared
characterized
through
dynamic
light
scattering
(DLS).
Tested
showed
single
or
bimodal
droplet
size
distributions
nanometric
range.
Results
highlighted
significant
repellent
activity
R.
cv.
verbenone
C.
(at
3%
concentration).
However,
trend
repellence
against
not
confirmed
at
decreasing
concentrations
(i.e.,
1%
0.5%).
Nanoemulsions
based
significantly
affected
choices
regardless
concentration.
Indeed,
no
bioassays,
lower
number
individuals
started
infesting
stems
treated
with
these
nanoemulsions.
On
other
hand,
effect
treatment
found
offspring
produced
survived
females.
Overall,
our
findings
provide
new
insights
toward
repellents
X.
compactus,
suggesting
future
incorporation
non-chemical
strategies,
'push-pull',
part
IPM
packages
pest.
Journal of Agricultural and Food Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 8, 2025
Avermectins
(AVMs)
and
their
derivatives
are
the
most
effective
widely
used
nematicides,
insecticides,
acaricides
against
endo-
ectoparasites
of
plants,
animals,
humans.
Demand
for
avermectins
highly
has
increased
due
to
high
cost-effectiveness
wide
range
applications
as
medicines
crop
protection
products.
Due
unique
structures
these
compounds
industrial
production
purposes,
numerous
efforts
strategies
have
been
dedicated
enhancing
creating
new
analogues
in
recent
years.
Here,
we
systemically
reviewed
studies
on
biosynthesis
application
derivatives,
including
avermectin
metabolism
its
related
bioregulation
Streptomyces
avermitilis,
approaches
bioproduction
avermectins,
structure
toxicology
future
prospects,
with
a
focus
advances
significance
superior
derivatives.
